Add support for ephemeral variables in terraform >= 1.10.0 #690

Job	Run time
specific required_version	22s
required_version range	23s
required_version with a v prefix	20s
tfswitch	21s
asdf	26s
TERRAFORM_VERSION range	21s
tfenv	25s
tofuenv	24s
TFC Cloud Configuration	41s
Partial TFC Cloud Configuration	53s
TFC Workspace	1m 2s
latest	26s
Local State file	19s
Remote State file	3m 1s
Partial TFC Cloud Configuration with tags	1m 8s
OPENTOFU_VERSION with tofu action	26s
OPENTOFU_VERSION pre-release with tofu action	31s
provider versions	37s
OPENTOFU_VERSION with terraform action	27s
Prefer OpenTofu, but only Terraform matches constraints	31s
	13m 4s

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